I already had 7 years working experience in o&g.
The PE interview is about the interviewee, not about the interviewer. Their interests are to gauge your experience based on your technical reports. I doubt whether they will engage you in a debate on the differences between o&g industry and their industry.
I gather that non o&g interviewers nowadays might have interviewed many prospective PEs from the o&g industry by now, so they might know something about o&g works, unlike during my time. My interviewers were surprised to know that API codes were widely used in o&g industry; obviously they thought that Msians were only knowledgeable in BS codes. This was in the mid 90's.
Good luck in your PE interview next year!

Owh..Hope after this there is more interviewer in O&G industry..In O&G Except for consultants, I realise that IR is not really matter, as long as u can prove that u have the exp required..But, I do hear some rumours saying client O&G want to implement the IR status..But I doubt it will, as in O&G there's a lot of foreigners and they dont even have the IR status..
Well some companies in O&G do implement IR, but as far of my exp, which is not much..All my lead engneer didnt have IR??
I don't know what you mumbling about....
1) Candidates have to know everything, Interviewers would ask what they know, not about what candidates knows.
2)o&g is industry name.